/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hive.metastore.metrics;

import com.codahale.metrics.Metric;
import org.apache.commons.collections.MapUtils;

import java.util.HashMap;
import java.util.Map;

public class MapMetrics implements Metric {

  private final Map<String, Integer> metrics = new HashMap<>();

  public MapMetrics() {
  }

  public void update(Map<String, Integer> data) {
    synchronized (metrics) {
      metrics.clear();
      if (MapUtils.isNotEmpty(data)) {
        metrics.putAll(data);
      }
    }
  }

  public Map<String, Integer> get() {
    synchronized (metrics) {
      return new HashMap<>(metrics);
    }
  }
}
